Old Boulder RD over Sep I 90 008
FairSweet Grass County, Montana · 1M E Big Timber · Structure no. L49103000+07001
- Built
- 1981
- 44 years old
- Condition
- Fair
- inspected March 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 286 ft
- 4 main spans
- Daily traffic
- 100
- 2025 count
- Owner
- State
- State Highway Agency
About this bridge
Old Boulder RD over Sep I 90 008 is a prestressed concrete stringer/multi-beam or girder carrying Old Boulder RD over Sep I 90 008 in Sweet Grass County, Montana. It was built in 1981, so it is 44 years old, younger than the Montana average of 47 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 286 ft (87.1 m) long and 34 ft wide.
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Old Boulder RD over Sep I 90 008 built?
It was built in 1981, making it 44 years old in 2025.
What condition is Old Boulder RD over Sep I 90 008 in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in March 2024.
How much traffic does Old Boulder RD over Sep I 90 008 carry?
About 100 vehicles per day (2025 count), of which roughly 3% are trucks.
How long is Old Boulder RD over Sep I 90 008?
The structure is 286 ft (87.1 m) long with a longest span of 100 ft (30.5 m) and a deck 34 ft wide.
Who owns Old Boulder RD over Sep I 90 008?
It is owned by the State Highway Agency.